That question came up to me, when recently working on one project I needed to restart my PC several times. And therefore, while I used 3-5 web apps I needed to log back in to each one of them again, after each restart. And I started wondering if privacy-wise that auto-clear feature is worth it or not? Has anyone maybe tested that?
It’s a ton of hassle if you’re logging into websites on that browser and I don’t think it provides much benefit unless it’s a shared computer and user account.
Firefox with uBlock Origin and Enhanced Tracking Protection enabled in strict mode blocks basically every type of tracker. You can add Cookie Auto Delete on top of that if you really want to make sure only sites you whitelist can save anything persistent like cookies or history.